EP1322142A1 - Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe - Google Patents

Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe Download PDF

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Publication number
EP1322142A1
EP1322142A1 EP02022782A EP02022782A EP1322142A1 EP 1322142 A1 EP1322142 A1 EP 1322142A1 EP 02022782 A EP02022782 A EP 02022782A EP 02022782 A EP02022782 A EP 02022782A EP 1322142 A1 EP1322142 A1 EP 1322142A1
Authority
EP
European Patent Office
Prior art keywords
circuit
electronic ballast
voltage
ballast according
control circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02022782A
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German (de)
English (en)
Other versions
EP1322142B1 (fr
Inventor
Frederick Stevens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonicatco GmbH and Co KG
Original Assignee
Tridonicatco GmbH and Co KG
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Application filed by Tridonicatco GmbH and Co KG filed Critical Tridonicatco GmbH and Co KG
Publication of EP1322142A1 publication Critical patent/EP1322142A1/fr
Application granted granted Critical
Publication of EP1322142B1 publication Critical patent/EP1322142B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions

Definitions

  • the present invention relates to an electronic ballast for operation at least one gas discharge lamp, which has a monitoring circuit, with the help of which a rectification effect occurring in the gas discharge lamp is recognized can be.
  • gas discharge lamps occur due to Signs of wear of the heating coils at the end of the life of the Gas discharge lamp the effect on the lamp electrodes over time wear unevenly or the removal of the emission layers on the Lamp electrodes is different. As a result of this different wear there are differences in the emissivity of the two lamp electrodes.
  • This difference in emissivity means that one Lamp electrode to the other a higher current flows than in the opposite direction, so that the time course of the lamp current during one of the two half-waves has an excess. Due to the different ablation of the two Lamp electrodes thus create asymmetries that are not only stronger Cause light flickering at the end of the life of the gas discharge lamp, but in In extreme cases, only operate during a half-wave. The In this case, gas discharge lamp acts like a rectifier, which is why this effect is also referred to as the so-called "rectification effect".
  • the monitoring circuit contains a filter, by means of which the lamp voltage by a rectifying effect resulting DC voltage component is determined.
  • an evaluation circuit provided, by means of which it is determined whether the DC voltage component within or is outside a permissible range, with a location outside the permissible range is an indication of the presence of a rectification effect.
  • the filter is preferably connected to the load circuit by a filter Voltage divider formed, over which the lamp voltage drops, with a lower Resistor of the voltage divider is bridged by a capacitor.
  • This The task of the capacitor is the AC component of the voltage to be measured largely suppress, so that at the connection point of the voltage divider forming resistors on which the measuring voltage for the evaluation circuit is removed, a DC voltage arises from a low AC voltage is superimposed.
  • the evaluation of the measurement voltage supplied to the evaluation circuit can be based on easily done with the help of comparators that determine whether the Measurement voltage exceeds an upper or lower limit.
  • the measurement voltage with the help of an analog / digital converter into one At least 2 bit existing digital value implemented and then digitally evaluates. This variant enables greater accuracy and reliability the determination of the rectification effect and also contributes to the integration of the Circuit at.
  • a development of the invention therefore consists in the fact that a control circuit the at least one operating parameter is provided by a switching regulator formed smoothing circuit for generating an intermediate circuit voltage detected and a controllable switch of the switching regulator depending on the value of the controls detected operating parameters, the detected operating parameters with the help an analog / digital converter into a digital value consisting of at least 2 bits is implemented and the control circuit based on this digital value in a digital Control part calculates switching information for operating the switch. This Switching information is then transmitted to a driver circuit, which this in implement a corresponding control signal to control the switch.
  • the monitoring circuit for detecting the Rectification effect is also at least partially digital, so with one also digital design of the control circuits for the DC link voltage and the Inverters a high level of integration of the entire circuit can be achieved.
  • analogue / digital converter preferably set the recorded values into digital values with an accuracy of 12 bit.
  • the electronic ballast shown in FIG. 1 is connected on the input side to the mains supply voltage U 0 via a high-frequency filter 1.
  • a rectifier circuit 2 in the form of a full-bridge rectifier, which converts the mains supply voltage U 0 into a rectified input voltage for the smoothing circuit 3.
  • the smoothing circuit 3 is used for harmonic filtering and smoothing the rectified supply voltage and comprises a smoothing capacitor C1 and a step-up converter having an inductor L1, a controllable switch in the form of a MOS field-effect transistor S1 and a diode D1.
  • the step-up converter used here, other switching regulator types can also be used.
  • a corresponding switching of the MOS field-effect transistor S1 generates an intermediate circuit voltage U Z which is present across the storage capacitor C2 connected to the smoothing circuit 3 and which is fed to the inverter 4.
  • the inverter 4 is formed by two further MOS field effect transistors S2 and S3, which are arranged in a half-bridge arrangement.
  • An alternating high-frequency activation of the two field effect transistors S2, S3 generates an AC voltage at their center tap, which is fed to the load circuit 5 with the gas discharge lamp LA connected to it.
  • This gas discharge lamp LA can in particular be a fluorescent tube.
  • the control of the three MOS field-effect transistors S1 to S3 of the smoothing circuit 3 and the inverter 4 is carried out by a control circuit 6, which generates corresponding switching information and transmits it to a driver circuit 7.
  • the driver circuit 7 converts the switching information generated by the control circuit 6 into corresponding control signals for the gates of the three MOS field-effect transistors S1 to S3.
  • This switching information is generated taking into account several operating parameters, which are tapped at different points in the smoothing circuit 3 and the load circuit 5 and fed to the control circuit 6.
  • To regulate the intermediate circuit voltage U Z on the one hand the intermediate circuit voltage U z itself and the current flowing through the inductance L1 or a voltage value corresponding to this current I L are measured.
  • the operating parameter recorded for the control of the inverter 4 is taken from the load circuit 5 and corresponds, for example, to the lamp voltage or the lamp current.
  • control circuit 6 has three analog / digital converters ADC 1 to ADC 3 on the input side, which convert the analog operating parameters taken from the smoothing circuit 3 or the load circuit 5 into digital values with an accuracy of at least 2 bit, preferably of 12 bit.
  • the three digital values are then fed to an arithmetic block 8 which, taking these current operating parameters into account, calculates control signals for the three switching elements S1 to S2 and transmits them to the driver circuit 7.
  • this digital version enables a very precise regulation of the intermediate circuit voltage U z and the power for the lamp LA and, on the other hand, offers the possibility of largely integrating the control circuit 6 and thus making it very compact.
  • the control unit 6 is designed as a so-called application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • the monitoring circuit according to the invention for Detection of a rectification effect in the lamp LA are explained.
  • This is a Evaluation circuit 10 is provided, which is also integrated in the control circuit 6.
  • the lamp LA is one of three resistors R1 to R3 and a capacitor C3 formed voltage divider 11 connected in parallel which a measurement signal is tapped and fed to the evaluation circuit 10.
  • the lower branch of the voltage divider 11 contains a parallel connection from the Resistor R3 and capacitor C3, between this parallel circuit and a further resistor R2 is arranged at the tap point for the measurement signal.
  • there the measuring signal is in turn by a fourth analog / digital converter ADC4 in a digital value consisting of at least 2 bits - preferably 12 bits implemented and then processed by the evaluation circuit 10 in a digital manner or evaluated.
  • this voltage divider 11 can be seen in FIGS. 2a and 2b, which on the one hand show the time profile of the lamp voltage U LA (FIG. 2a) and on the other hand the input signal U tapped at the connection point between the two resistors R1 and R2 and fed to the control circuit 6 i (Fig. 2b).
  • the task of the capacitor C3 is to largely suppress the AC component of the lamp voltage U LA .
  • From the voltage signal U LA shown in Fig. 2a which essentially consists of an AC signal with a very low DC voltage component - shown by the dash-dotted line - is accordingly a DC voltage signal is formed and fed to the control circuit 6, which is supplied by one only low AC voltage is superimposed.
  • the voltage divider 11 thus has the function of a filter which largely reverses the conditions present on the lamp LA.
  • the measurement signal U i shifted by the value ⁇ U should fluctuate periodically by this value ⁇ U.
  • the output signal, ie the voltage U LA applied to the lamp LA is already afflicted with a certain direct current, so that the measurement signal U; is slightly above the reference value ⁇ U.
  • the evaluation circuit 10 now determines whether this deviation from the reference signal ⁇ U exceeds a predetermined maximum limit upwards or downwards, which is shown in FIG. 2c by the two dotted lines.
  • the DC component is so small that the upper or lower limit is never exceeded at any time, so that no rectifying effect is determined.
  • the DC voltage component of the lamp voltage U LA applied to the lamp LA is significantly higher, so that the measurement voltage U i shifted by the offset voltage ⁇ U exceeds the upper limit value several times.
  • the evaluation circuit 10 consequently transmits a corresponding signal to the arithmetic block 8 of the control circuit 6, which in response to this signal either completely switches off the electronic ballast or at least reduces the power supplied to the lamp LA in order to avoid excessive heating.
  • the capacitor C3 provided in the voltage divider 11 applies that this must not be too large, otherwise the evaluation will be too sluggish would. Furthermore, a large capacitor would be relatively expensive and would Increase circuitry costs. On the other hand, the capacitor not to be too small, otherwise the suppression of the AC voltage component is not done sufficiently and accordingly the accuracy of the Evaluation would be reduced.
  • FIG. 4 shows a further variant of the ballast according to the invention.
  • the measurement signal tapped at the voltage divider 11 is not raised here by an internal current source within the control circuit 6, but by a resistor R4 connected to the measuring line 12, the other terminal is connected to a positive supply voltage potential V +.
  • this variant is characterized by its simple structure and their high reliability.
  • the advantage of the monitoring circuit according to the invention for recognizing the rectification effect is that the circuit is very simple and does not require any complicated additional components.
  • the digital processing of the measurement signal U i also ensures a high degree of reliability in the detection of a rectification effect, it being possible for a rectification effect to be detected in both directions of the lamp LA.
  • the four analog / digital converters ADC1 to ADC4 instead of the four analog / digital converters ADC1 to ADC4, only a single analog / digital converter can be used, which works in time-division multiplexing for processing the various operating parameters or measured values.
  • Another variant is to use two comparators instead of the fourth analog / digital converter ADC4 to determine whether the measurement signal is outside or within the permissible range.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
EP02022782A 2001-12-20 2002-10-11 Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe Expired - Lifetime EP1322142B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10163033 2001-12-20
DE10163033A DE10163033A1 (de) 2001-12-20 2001-12-20 Elektronisches Vorschaltgerät mit Überwachungsschaltung zum Erkennen des in einer Gasentladungslampe auftretenden Gleichrichteffekts

Publications (2)

Publication Number Publication Date
EP1322142A1 true EP1322142A1 (fr) 2003-06-25
EP1322142B1 EP1322142B1 (fr) 2006-04-12

Family

ID=7710213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02022782A Expired - Lifetime EP1322142B1 (fr) 2001-12-20 2002-10-11 Ballast électronique avec un circuit de surveillance de l'effet redresseur de la lampe

Country Status (3)

Country Link
EP (1) EP1322142B1 (fr)
AT (1) ATE323398T1 (fr)
DE (2) DE10163033A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006117809A1 (fr) * 2005-05-04 2006-11-09 Stmicroelectronics S.R.L. Systeme de commande pour lampe a decharge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357538B4 (de) * 2003-12-10 2014-08-28 Vossloh-Schwabe Deutschland Gmbh Vorschaltgerät mit verbesserter Lampenüberwachung
DE102009055720A1 (de) * 2009-11-26 2011-06-01 Bag Engineering Gmbh Elektronisches Vorschaltgerät und Beleuchtungsgerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626209A1 (de) * 1986-08-02 1988-02-04 Telefunken Electronic Gmbh Vorschaltgeraet fuer wenigstens eine entladungslampe
WO1999034647A1 (fr) * 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Procede et dispositif permettant de detecter l'effet redresseur apparaissant dans une lampe a decharge
US5939832A (en) * 1996-05-15 1999-08-17 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Safety disconnection with asymmetric lamp power
US6005354A (en) * 1996-10-21 1999-12-21 International Rectifier Corporation Ballast IC with shut-down function
US6160361A (en) * 1998-07-29 2000-12-12 Philips Electronics North America Corporation For improvements in a lamp type recognition scheme

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626209A1 (de) * 1986-08-02 1988-02-04 Telefunken Electronic Gmbh Vorschaltgeraet fuer wenigstens eine entladungslampe
US5939832A (en) * 1996-05-15 1999-08-17 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Safety disconnection with asymmetric lamp power
US6005354A (en) * 1996-10-21 1999-12-21 International Rectifier Corporation Ballast IC with shut-down function
WO1999034647A1 (fr) * 1997-12-23 1999-07-08 Tridonic Bauelemente Gmbh Procede et dispositif permettant de detecter l'effet redresseur apparaissant dans une lampe a decharge
US6160361A (en) * 1998-07-29 2000-12-12 Philips Electronics North America Corporation For improvements in a lamp type recognition scheme

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006117809A1 (fr) * 2005-05-04 2006-11-09 Stmicroelectronics S.R.L. Systeme de commande pour lampe a decharge
US7902764B2 (en) 2005-05-04 2011-03-08 Stmicroelectronics S.R.L. Control device for discharge lamp

Also Published As

Publication number Publication date
EP1322142B1 (fr) 2006-04-12
ATE323398T1 (de) 2006-04-15
DE10163033A1 (de) 2003-07-03
DE50206374D1 (de) 2006-05-24

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